Vue

1. 没有文件服务器, 前后端采用文件流方式下载,后端返回二进制乱码时,前端使用blob对象进行处理
   2.采用的是axios请求方式
2. this.$http.post("download", { fileName: file.filename })
   .then(function(response) {
   let blob = new Blob([response.data], {type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8'});
   let downloadElement = document.createElement('a');
   let href = window.URL.createObjectURL(blob); //创建下载的链接
   downloadElement.href = href;
   downloadElement.download = 'xxx.xlsx'; //下载后文件名
   document.body.appendChild(downloadElement);
   downloadElement.click(); //点击下载
   document.body.removeChild(downloadElement); //下载完成移除元素
   window.URL.revokeObjectURL(href); //释放掉blob对象
   })

3.1
this.$http.post("download", { fileName: file.filename } ,{responseType: 'arraybuffer'}) // 或者responseType: 'blob'
.then(function(response) {

                 let blob = new Blob([response.data], {type: 'application/vnd.ms-excel'});

                    if (window.navigator.msSaveOrOpenBlob) {
                           //兼容ie
                        window.navigator.msSaveBlob(blob, file.filename);

                    } else {

                        let downloadElement = document.createElement('a');
                        let href = window.URL.createObjectURL(blob); //创建下载的链接
                        downloadElement.href = href;

                        downloadElement.download =  file.filename;//下载后文件名


                        document.body.appendChild(downloadElement);
                        //此写法兼容火狐
                        let evt = document.createEvent("MouseEvents");
                        evt.initEvent("click", false, false);
                        downloadElement.dispatchEvent(evt);

                        document.body.removeChild(downloadElement);
                    }

   }) 

4.分享链接 https://www.oschina.net/question/3910533_2283267

1. 前端处理文件流自动下载并兼容ie9+ https://blog.csdn.net/skye_Z/article/details/81135540